Base member for separable attachmnet-plugs.



APPLICATION FILED MAY 7, 1914.

Patented Mar. 2

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Wmeawea UNTTET) STATES PATENT @FTTTJE.

JOHANN G. PETERSON, OF JERSEY CITY, NEW JERSEY, ASSIGNOR T0 MANHATTAN ELECTRICAL SUPPLY COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

Patented Mar. 2, 1915.

Application filed May 7, 1914. Serial No. 836,896.

To all 'w/lom it may concern lie it known that I, .loiianx (l. PETERSON, a citizen of the United States, residing at Jersey City, in the county of Hudson and State of New Jersey, have invented'certain new and useful Improvements in Base Members for Separable Attaclu11entllugs, of which the lollowing is a specification.

This invention relates to base-members for separable attachment-plugs, among the objects of the invention being the provision of an article of this character which is simple in construction, the parts of which can be inex 'iensively made and easily assembled and which when in assembled relation are maintained in such condition in a substantial manner.

1n the d awings accompanying and forming part of the present specification I have shown in detail one oi? the several c011- vcnient forms of einl.)odiniei1t of the invention, which to enable those skilled. in the art to praclice the same will be set forth in the following description. I do not restrict myself to this disclosure; 1 may depart 'there'lrom in several respects within the scope of the invention defined by the claims following; said description.

Referring to said drawings: Figure 1 a vertical sectional view of abaseaneinbcr oi a separable atlachlnent-plu embodying my invention. Fig. 2 is a bottom plan view of said lmseaneiuber. Fig. 3 is a. top plan view ol the same. Fig. l is a bottom plan view oi? the contact shell. Fig. i is a like view ol the core. of a washer.

Like chara ters re'l er to throughout the several figures.

The present device is of a nature susceptible to advantageous use in connection with or as part oi any separable attachmentplug, an example o'l such an article being shown in Letters latent No. 1,093, 1-(38 granted to me April ll, .ll l-land to which refereuce may be had. In said Letters Patent there is a body and a cap. In the present instance I will term the body a base mem ber, as this is what i. understand to be the usual term applied to such an element, the invention residing in the body or base member of the attachment plug. Said base member invol in its makeup core as 2 which is usually of insulating material and like parts Fig. (l is a plan view fiber or any of the substance rdinarily employed in this connection, may be utilized for the formation of said core. The lower end of the core 2 is of reduced diameter as at 3, the reduction in diameter forming a shoulder at to constitute a bearing for the inturned flange 5 of the contact shell 6. \Vhile this shell is shown as threaded, this may not in all cases be necessary, it being understood that the invention is .not re stricted to this and similar details. The reduced portion 3 constitutes in eltect an extension from the body or main portion of the core 2 and as a matter of convenience it is shown as being of a mroximately i'rnstoconical 'form. which as will be understood is of metal, brass being usually provided for this purpose, preferably closely hugs the main or body portion of the insulating core member 2, 1 do not rely upon this to prevent relative. rotation of the parts but provide more positive means to insure this result, there being in the present case a key connection between the two parts. For instance the shell may as shown have one or more proways in the core member There are Qeuerally two of such. keys shown, being do noted by T and 8 and as illustrated extend lug inward from and in the plane of the flange 5; they are also approximately diametrically opposite oath other. I prefer that these keys and the keyways also be. 0! dill'err-ut shapes, and such shapes may vary decidedly; as illustrated the key 7 rounded while the key 8 is rectangular, the key 7 being adapted to fit the key-way J, while the key 8 adapted to lit the keyway 10, the

two kc ways being in the core member and While the contact shell 6,

ections constituting such keys to lit key- Y centrally of the lower end of the core 2 and as provided with an inwardly extending hollow stud 18 fitted in the central socket 19 in the bottom of the core member 2. From this central contactor disk 17 the L-shaped projection 20 extends, the screw 16 extending freely through one branch of the angu-' lar extension 20 which as will be understood is situated in the keyway 10, the head of the screw-16 having an electrical contact with the extension 20 and therefore with the contact 17. The threaded portion of this screw 16 is tapped into an outward extension of the contact finger 14.- so as to put the said finger 16 into electrical connection through the described intervening parts, with the end contact 17. This screw 16 extends through an opening such as the perforation 21 in the key 8, theopening being of. such size that the screw 16 will be insulated therefrom at this point, this result being obtained by making said opening 21 of larger diameter than that of the screw, by reason of which the wall of said opening is insulated from saidscrew 16. interposed between the extension 10 and the shell 6 and surrounding the shank of the screw 16 is a washer 22 of fiber or other insulating material, shown as fiat and which further insulates the screw 16 from the shell 6. The screw 15 electrically connects the contactiinger with the lateral What I claim is:

1. A base-member for separable attaching core' having an extension, and a shoulder at the junction of the body. portion and extension, a contact shell surrounding the body portion, provided with an inturned flange bearing against .said shoulder, said flange having inward projections constituting keys, and the extension ment-plugs, comprising a one-piece insulat and the body portion having keyways to receive said keys, the latter having perforations, a contact device in the core, a screw for holding said contact device in place, electrically connected with said shell, one of the projections having a perforation to receive said screw, a second contact device in the core, a second screw for holding the second contact device in place, an end contact having an extension to which the second screw is connected, the other projection having a perforation of greater diameter than and through which the second screw passes, an insulating material between said second extension and the contact shell.

2. An insulating base member for separable attachment plugs, a shell surrounding said base member and having an inturned annular flange, the base member having an annular shoulder against which said flange bears, contacts in the base member, a screw for holding one of the contacts in place and for electrically connecting the same with said shell, a second screw for holding the shell in place, insulated from said shell and connected with the other contact, and a central end contact electrically connected with the second screw and provided with a projecting stud,-the base member being socketed to receive said stud.

In testimony whereof I atlix my signature 

